Momoko and Asako are half sisters, daughters of the famous architect Tsuneo Mizuhara, who also have another half sister in Kyôto, Wakako, whom they have not had. While Asako is a sweet young lady, Momoko, the eldest, goes out with whomever she wants, thus hiding the trauma caused by seduction and abandonment during the war by young Keita Aoki. One day Keita re-enters her life.

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